What Is A Floodplain Zone Someone said if we used UL1558 it will helps to meet selective fully coordination as required by NEC article 700 on emergency distribution system can t do this with UL891
I m editing a UL 1558 switchgear spec I m specifying that it be 85kAIC rated but then the guideform spec I m using indicates that Close and Latch ratings for all frame sizes is With that in mind when it is specified as being listed 891 or 1558 the overall assembly gets listed As part of the assembly listing many of the components within the
What Is A Floodplain Zone
What Is A Floodplain Zone
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Switchgear standards are UL 891 and 1558 but there is some crossover between them assuming you stick with UL standards instead of the older ANSI standards Modern UL 1558 listed Switchgear rated at 4000A At its worst case which will probably never be reached continuous load provided by several 100 rated feeder breakers totals
Breakers are perfectly acceptable Both ANSI types can be tested to this standard although UL 1558 is a less restrictive standard UL 1077 is for breaker components The reason I ask is that I recently ran into the a 2000A feeder from one UL 1558 switchgear to another 1558 switchgear for which the cable used 4 sets of 600kcmil doesn t
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Switchgear and switchboard structures are built and tested to different standards Switchgear to ANSI standard C37 20 1 UL standard 1558 and NEMA standard SG 5 Switchgear is not the same as Switchboard and Switchgear is also an official term for equipment listed under UL 1558 NEMA SG 5 and ANSI C37 20 Load Centers are a less
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Someone said if we used UL1558 it will helps to meet selective fully coordination as required by NEC article 700 on emergency distribution system can t do this with UL891
https://forums.mikeholt.com › threads
I m editing a UL 1558 switchgear spec I m specifying that it be 85kAIC rated but then the guideform spec I m using indicates that Close and Latch ratings for all frame sizes is
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What Is A Floodplain Zone - The reason I ask is that I recently ran into the a 2000A feeder from one UL 1558 switchgear to another 1558 switchgear for which the cable used 4 sets of 600kcmil doesn t
